166435663 has 2 divisors, whose sum is σ = 166435664. Its totient is φ = 166435662.

The previous prime is 166435639. The next prime is 166435679. The reversal of 166435663 is 366534661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166435663 - 2²¹ = 164338511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166438663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83217831 + 83217832.

It is an arithmetic number, because the mean of its divisors is an integer number (83217832).

Almost surely, 2^166435663 is an apocalyptic number.

166435663 is a deficient number, since it is larger than the sum of its proper divisors (1).

166435663 is an equidigital number, since it uses as much as digits as its factorization.

166435663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 40.

The square root of 166435663 is about 12900.9946515763. The cubic root of 166435663 is about 550.0668381582.

The spelling of 166435663 in words is "one hundred sixty-six million, four hundred thirty-five thousand, six hundred sixty-three".